pathfindig issuse

Hi, im tring to do a small game but can't find the way to make a good pathfinding mechanic. What I want to do (as you may see in the project) is to create random 'creatures' when I click the chest and I want those 'creatures' to follow me and try to kill me. At the same time, zombies respawn ever x seconds but they follow me only when they see me (big color squares represent area of view)

The thing is, when the zombie sees me (contact with area of view) he follows me but to the coordinate to witch he last saw me, not for ever. Is there a way to do it for ever or for an amount of time?

Thanks a lot!

dropbox.com/s/ttqz5tjod6vz9w6/tu%20mama.capx

then try having him keep going toward after he reaches the destination and drop a pair of eye where he last saw you and when he gets there have him keep following if he can still see you

check out spy mouse on the app store you'd see what i'm saying